Would be interesting to see if the idea was to have the server + client native complete with local storage and then have the BEAM node connect elsewhere.
Got a github link https://github.com/lumen/ but it seems abandoned and not actively maintained
Firefly is the new name, Lumen the old. Lumen lost momentum for a bit, DockYard seems recommitted to finishing it up.
I think it has fantastic promise.
Source: was helping publish news back when